Cocoa butter or coconut oil.
Im going thru the exact same thing. I went to the store today and,bought Natural Shea Butter. and today its been a HUGE relief. You can find it at your beauty supply store but not all carry it. Its made my stretch marks lighter,always its suppose to hell them as well as dark marks. Its been great so far!
Mine gets better when I massage it with some natural oil or Vaseline...
But this itching some times occurs in my hands and feet or my breasts. Then I go crazy...